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SubjectRe: [PATCH 1/1] tcp: Wrong timeout for SYN segments
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On Thu, 2012-08-23 at 14:37 +0200, Alex Bergmann wrote:

>
> From be551f82499112e4775b6d579d58967510b6d492 Mon Sep 17 00:00:00 2001
> From: Alexander Bergmann <alex@linlab.net>
> Date: Thu, 23 Aug 2012 14:33:35 +0200
> Subject: [PATCH 1/1] tcp: Increase timeout for SYN segments
>
> Commit 9ad7c049 changed the initRTO from 3secs to 1sec in accordance to
> RFC6298 (former RFC2988bis). This reduced the time till the last SYN
> retransmission packet gets sent from 93secs to 31secs.
>
> RFC1122 is stating that the retransmission should be done for at least 3
> minutes, but this seems to be quite high.[1]
>
> This patch increases the value of TCP_SYN_RETRIES to the value of 6,
> providing a retransmission window of 63secs.
>
> [1] RFC 1122 - 4.2.3.5 TCP Connection Failures
>
> Signed-off-by: Alexander Bergmann <alex@linlab.net>
> ---
> include/net/tcp.h | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/include/net/tcp.h b/include/net/tcp.h
> index 1f000ff..f309e93 100644
> --- a/include/net/tcp.h
> +++ b/include/net/tcp.h
> @@ -98,7 +98,7 @@ extern void tcp_time_wait(struct sock *sk, int state, int timeo);
> * 15 is ~13-30min depending on RTO.
> */
>
> -#define TCP_SYN_RETRIES 5 /* number of times to retry active opening a
> +#define TCP_SYN_RETRIES 6 /* number of times to retry active opening a
> * connection: ~180sec is RFC minimum */
>
> #define TCP_SYNACK_RETRIES 5 /* number of times to retry passive opening a

Acked-by: Eric Dumazet <edumazet@google.com>

A change of the comment might be good, to help future readers.





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